Chicago cold weather

Chicago cold weather

Michael Tercha, Chicago Tribune

Commuters brace against the cold on Lake Street at Michigan Avenue in downtown Chicago. Wind chill values could reach minus-25 degrees overnight, and the air will be cold enough to cause frostbite in half an hour for exposed skin, according to the weather service.

Commuters brace against the cold on Lake Street at Michigan Avenue in downtown Chicago. Wind chill values could reach minus-25 degrees overnight, and the air will be cold enough to cause frostbite in half an hour for exposed skin, according to the weather service. (Michael Tercha, Chicago Tribune)

Commuters brace against the cold on Lake Street at Michigan Avenue in downtown Chicago. Wind chill values could reach minus-25 degrees overnight, and the air will be cold enough to cause frostbite in half an hour for exposed skin, according to the weather service.